反应详情

To a stirred suspension of 9.6 (0.24 mol) of 60% sodium hydride-mineral oil in 100 mL of DMF under nitrogen at 0° C. was added dropwise 50.0 g (0.226 mol) of 4,5-diphenylimidazole in 400 mL DMF. The mixture was allowed to warm, stirred at room temperature 1 hr, and 26.6 mL (0.24 mol) of ethyl bromoacetate was added. The reaction was stirred 18 hr at room temperature, heated on a steam bath 2 hr, cooled, and stripped. The residue was partitioned between water and methylene chloride, dried over MgSO4, and filtered through a silica gel column eluting with methylene chloride-ethyl acetate to provide 50.1 g of an oil that solidified on standing. It may be used in further reactions as is, or it may be recrystallized from ether to yield 35.1 g of product mp 89°-90° C.

1. temperatureto warm
2. stirringThe reaction was stirred 18 hr at room temperature
3. temperatureheated on a steam bath 2 hr
4. temperaturecooled
5. customThe residue was partitioned between water and methylene chloride
6. dry with materialdried over MgSO4
7. filtrationfiltered through a silica gel column
8. washeluting with methylene chloride-ethyl acetate